Redevelopment in absence of flat owner

Hi, My father had one flat( Co-op. Housing Society) in Thane district which was on his name. He passed away recently and my mother is also no more. There was no will or any nomination for this flat. I have submitted an application in society for share transfer along with NOC from my sister and indemnity bond. My sister does not any objection in releasing her rights and is clearly described in NOC. But despite this, society is not transferring the share certificate on my name and giving lame excuses every time. Now there is one new thing happening, some builder has shown interest and discussion of redevelopment is going on. So my question is if flat is on my deceased father name and society has not transferred on my name, then what would be consequences in this case? Can Society go ahead with redevelopment process without consent from our flat?